RE: [CAD_CAM_EDM_DRO] Speed - Parallel vs serial ( was Re: Motor

Okay, I did a lot of driving today, so I had time to think about this.
This may or may not work.

Use a DVM to find the coil wires by checking resistance between wires.
Label them something like A, B, C and D.

Now, switch the meter over to DC volts. Connect coil A to the meter.
Give the motor a spin, and note the polarity of the voltage. If it's
positive, label the motor wire connected to the red meter lead +, if
negative, label the wire connected to the black lead +. Label the other
wire - if you want. Repeat for B, C and D, turning the motor the same
direction each time.

Go get a flashlight battery. If your motor is less than 1.5 volts, use a
10ohm resistor in series with it. Put a little mark on the motor shaft
so you can see it move. Connect A-, B-, C- and D- to the - end of the
battery. While watching the motor shaft, connect A+ to the plus end. You
should see a twitch in one direction or another. If you don't see a
twitch check A- and A+ with the ohm meter, then check the battery with
the volt meter. Now while holding the A- and A+ wires on the battery,
connect B+ to the + end of the battery. If you don't see a twitch,
you've gotten lucky and that's a pair of coils. If you do see a twitch,
take B+ off and try C+, then D+, all the while keeping A+ connected.

Now, if you see a twitch with all the coils, try connecting B+, C+ and
D+ to the - end of the battery, and connecting B-, C- and D- to the +
end of the battery, one at a time. If you still see a twitch, then I
don't have a clue :-)

I don't have any 8 lead motors lying around, but I believe this will
work for you.

BTW, I have unipolar motors and used the battery twitch method to find
out the coil sequence. By connecting both center taps to the - end of a
D cell, I touched the other wires to the + end until I found the right
sequence so all the twitches were in the same direction.

Hope that helps.

Regards,
JJ

Be Kind, Be Careful, Be Yourself

> -----Original Message-----
> From: turbulatordude [mailto:davemucha@...]
> Sent: Tuesday, September 03, 2002 7:36 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Speed - Parallel vs serial ( was Re: Motor
>
>
> <snip>
>
> >
> > For wiring 8 wire stepper motors, go to www.geckodrive.com and look
> at their
> > white paper on stepper motors.
>
> I did that first. an 8 wire stepper uses 2 sets (pairs) of coils, it
> does not go into how to decide which two pairs to connect.
>
> Dave
>
>
>
>
>
>
> Addresses:
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>
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